JPH03240594A - Printing plate for flexure printing - Google Patents

Abstract

PURPOSE:To avoid the generation of ink irregularity by preventing the distortion pattern due to the expansion and contraction of a printing plate by bonding a printing plate made of a synthetic resin and a mesh hard to deform in a plane direction and having the flexibility to bending to perform flexure printing. CONSTITUTION:In the mesh used in a printing plate for flexure printing, for example, woven crossings where metal wires are in contact with each other are bonded by plating. By this method, the metal wires of a node part are mutually bonded and, when tensile force is applied to the mesh in the plane direction thereof, it is prevented that the metal wires are mutually shifted at the woven crossings like a conventional fabric type mesh. An org. printing film is formed to the mesh thus formed hard to deform against the tensile force in the plane direction thereof by laminating a photosensitive film to the mesh by a laminator to perform pattern exposure, development and plate making. By this method, the mesh can be adapted to flexure printing while a synthetic resin film is used as the surface of the printing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Field and Object of the Invention The present invention relates to a screen printing plate applicable to improved screen printing machines that have already been proposed in the field of screen printing.

The screen printing plates conventionally used are the first (
As shown in Figure a1, the screen mesh is fixed by four circumferences, and the screen mesh supports a metal plate having ink permeation holes, or the first (
As shown in figure bj, four metal plates with ink permeation holes are
It had a configuration in which it was fixed by two fixed frames.

As shown in FIG. 2, these conventional screen printing plates fix a screen printing mesh and a printing plate in a shallow ark-shaped frame, and form a desired pattern onto the mesh by optical or physical methods. Ink was placed on the screen printing plate and printed by applying pressure with a squeegee.

In a printing plate that supports a metal plate through a mesh shown in FIG. 1(a), the mesh is forcibly pressed against the printing material 6 by the squeegee 2 as shown in FIG. 3(a) during printing. On the other hand, when printing is not being performed, the mesh and printing plate are required to be separated from the printing substrate 6, as shown in FIG. It was required that the length of the mesh and printing plate in the surface direction be different between when printing and when not printing.

However, this expansion and contraction of the screen in the surface direction means that the screen printing plate itself gradually stretches as the number of printing increases, causing dimensional errors in the printed pattern.
Furthermore, it causes the screen printing plate not to be sufficiently separated from the surface of the printing medium after printing is completed (so-called printing plate separation failure).

On the other hand, even during printing as shown in FIG. 3(a), as the squeegee moves to the edge of the printing medium, the squeegee is located at the edge, compared to the case where it is located at the center of the mesh and printing plate. (This point is compared to when the squeegee is located in the center.)
It is clear from the fact that the length of the mesh becomes longer when the squeegee is located at the end. ), the mesh becomes larger on the edge side of the printing plate, which causes density unevenness in In4.

Also, as the squeegee moves to one end, the snap-off angle between the screen and the printing material (by α in FIG. 3(a)) changes on the side opposite to the side where the squeegee holds ink. As a result, the ink becomes more difficult to pass through than the center of the printing material, and this change in angle also causes uneven ink density on the printing material. became.

In a screen printing plate in which a metal plate having a desired pattern is directly fixed by a fixing frame as shown in Fig. 1(b), the printing plate is completely attached to the substrate as shown in Fig. 4. The squeegee 2 can be brought into contact with the metal plate and scanned over the flat printing plate, or as shown in FIG. 3(a), the squeegee 2 A method was used in which the metal plate was forcibly pressed against the printing material 6 by using the following method.

However, in the contact method shown in Figure 4, the printing plate does not separate from the printing material even after the squeegee scans, so the ink remaining on the ink permeation holes gradually penetrates into the printing material. Clear printing cannot be obtained due to ink stains in the border area, etc.
Furthermore, when the printing method shown in Figure 3(a) is used for a metal plate, the metal plate is forcibly stretched with a squeegee, even though the metal plate itself is difficult to stretch when pulled in the plane direction. As a result, the metal plate may be damaged or the fixing frames in both directions may be deformed, and as the number of printing increases, the shape of the ink permeation holes will be deformed, making precise printing impossible.

In order to improve this problem, as shown in Figure 5, at the tip P of the squeegee, the screen on the side opposite to the ink holding side is set so that the snap-off angle α is constant. Providing a guide 11 in which the end portion A moves, or as shown in FIG. In order to keep the snap-off angle α constant, guides 11 and 12 are provided so that the ends A and B of the screen move, and as shown in FIG. A method has been invented in which the opposite end of the screen is moved along a linear guide so that the other end of the screen can be moved reversibly with the movement of the squeegee, and an application has already been filed with the Japanese government. .

In these improved screen printing machines, both ends of the printing plate are movable, so it is not necessary to expand and contract in the surface direction like the conventional printing plate, but it also eliminates the drawbacks mentioned above. This is a negative point in that it gives rise to

On the other hand, since the screen printing plate is pressed against the printing surface by a moving squeegee, flexibility is required, no different from the conventional case.

Thus, in the improved screen printing machine as described above, it is essential to use a screen printing plate that is not easily deformed by tensile force in the in-plane direction, and at the same time has flexibility. However, printing that uses such a screen printing plate and is performed while moving the edges of the screen printing plate has already been defined as "flexure printing."

An object of the present application is to provide a printing plate for flexure printing that can be applied to such flexure printing while using a synthetic resin film as the surface of the printing plate.

(Means for Solving the Problems) In order to obtain such a printing plate, the configuration of the present invention is to form a printing plate made of a synthetic resin that has ink permeation holes in a desired pattern shape and is bendable in the surface direction. A flexure printing plate is obtained by laminating a mesh that is difficult to deform and has flexibility against bending, and does not use a fixed frame that surrounds the bonded plate film and the mesh on four sides.

This will be explained in detail below.

In screen printing, a mesh is provided in the printing permeability hole when there is an isolated part 31 of the metal plate surrounded by the ink permeation hole 33 as shown in FIG. It is necessary to join the isolated parts with the mesh 32 (on the contrary, if the mesh 32 is not used, the isolated metal plate part 31 will come off and this part will also become an ink permeation hole) ■If the area of the ink permeation hole is large, a large amount of ink will permeate through this area, penetrating the surface of the printing substrate, making the ink concentration too high, and penetrating within the boundaries of the ink permeation hole. This is due to the appearance of ink stains with unclear boundaries on the printing substrate.

However, in the flexure printing plate of the present application, a synthetic resin film is used as the surface of the printing plate as described above, but -fi19, since the synthetic resin film is easily deformed by tensile force in the surface direction. On the other hand, in order to obtain the property that the entire film is not easily deformed by tensile force in the planar direction, a mesh that is not easily deformed in the planar direction is bonded to the synthetic resin film.

However, in conventional screen printing, the mesh used on the screen surface has a characteristic that it is rather easily deformed by tensile force in the surface direction.

As is clear from FIG. 3(a) and FIG. 3(b), this can be done by squeezing the screen surface onto the non-printing material 6.
This is because the mesh constituting the screen was necessarily required to expand when moving while being pressed so as to come into contact with the screen. Therefore, in the present application, the mesh used for the screen surface in conventional screen printing cannot be used as is.

Specific examples of the mesh used in the flexure printing plate of the present application will be described below.

Example 1 In contrast to the conventional woven mesh used for the screen surface as shown in Fig. 9(a), we created an interwoven mesh in which metal wires are in contact with each other as shown in Fig. 9(b). Joined by plating.

As a result, the metal wires at the knot are bonded to each other, and even if a tensile force is applied in the plane direction of the mesh, the metal wires will not shift at the weaving intersection unlike conventional woven fabric meshes, so the mesh will be It has a property that it is difficult to deform in any direction.

Example 2 As shown in FIG. 9(C), a non-woven metal wire mesh is used as the mesh.

As such a non-woven metal wire mesh, for example,
This includes metal meshes obtained by electroforming, such as "Hi-mesh" and "α-mesh", or metal meshes obtained by etching (forming by corrosive action with acid, etc.).

Example 3 Mesh made of synthetic resin such as polyester, nylon, polyethylene (including both woven and non-woven fabric types), carbon fiber filament, glass fiber, natural yarn such as silk thread, cotton thread, hemp thread, etc. When metal plating is applied to the surface of a woven cloth type mesh, the property that these synthetic resin or natural thread meshes originally have, which makes them easy to deform due to tensile force in the plane direction, is lost due to the surface plating.
On the contrary, it has a property that it is difficult to deform under tensile force in the plane direction.

The organic plate film is generally formed on the mesh, which is not easily deformed by the tensile force in the low direction shown in the above embodiments, by a photochemical method using an ordinary screen plate making method.

That is, a photosensitive film is laminated onto the mesh using a laminator, pattern exposure is performed, development is performed, and plate making is performed. According to Aicello Kagakusha's wet plate making method, the process is as follows. Prepare a fixed frame covered with mesh in advance. In addition, one protective film of the photosensitive film (trade name ACT) is peeled off, and the film is left standing on a surface plate, and water is evenly sprayed onto the surface of the photosensitive film using a mist to moisten it. Furthermore,
A fixed frame prepared in advance is placed on the surface of the film, and the photosensitive film ( Product name Act) is pasted together. Thereafter, the photosensitive film is cured by exposure to UV light using a film with the desired pattern;
Fix the film onto the mesh. Thereafter, the plate is developed and dried in a conventional manner to obtain a screen printing plate.

The flexure printing plate according to the present invention is composed of a mesh obtained by removing the fixed frame from the screen printing plate and an organic plate film, and depending on necessity (reasons for handling the printing plate), the opposite sides of the screen printing plate can be It has two support rods attached to the ends.

Example 4 A fixed frame covered with a nickel metal mesh (product name: Hi-Mesh) sold by Stoke Co., Ltd. as the mesh shown in Example 2 was prepared in advance by 4 (M). Peel off the protective film, leave it on a surface plate, and spray water evenly onto the surface of the photosensitive film to moisten it.Furthermore, place a fixed frame prepared in advance on the surface of the film. , slide the mesh surface with a rubber squeegee while applying light pressure, removing excess water at the same time,
A photosensitive film (trade name: ACT) is laminated on the surface of the mesh. Thereafter, the photosensitive film is photocured by exposure to ultraviolet light using a mask film having a desired pattern, and the photosensitive film is fixed onto the mesh. After that, it is water-removed and dried in the usual way using a spray gun to obtain a normal screen printing plate. A printing plate film consisting of a mesh and an organic plate film is obtained by removing the fixing frame from the screen printing plate, and two
A printing plate for flexure printing according to the present invention was prepared by adhering and fixing a book support rod.

By the way, the flexure printing plate of the present application is based on the premise that one end or surface end of the printing plate moves with the movement of the squeegee during printing. Support bodies 4L 42 are provided at opposite ends as shown in FIG.
The embodiment shown in FIG. 1Hb includes a case where the printing plate is moved along the holder, and a case where a holder is not particularly provided as shown in FIG. 10(b) and the edge of the printing plate is moved along the holder. In this case, either a hole is provided at the end of the printing plate and the holder passes through the hole, or a gripping portion is provided to connect the end of the printing plate and the holder. However, the edges of the printing plate must be made of a material that is firm and difficult to deform. ).

That is, the flexure printing plate of the present application has both embodiments in which the supports 41 and 42 are provided at both end portions and in which the supports 41 and 42 are not provided.

(Operations and Effects of the Invention) In the flexure printing plate of the present application having the above configuration, since the four circumferences are not surrounded by a fixed frame, flexure printing as shown in FIGS. 5, 6, and 7 can be easily performed. applicable.

In other words, due to the flexibility of the printing plate itself, it is possible to perform printing while bending and deforming as the squeegee moves, and since it is extremely difficult to expand and contract in the plane direction, the printing plate can be easily expanded and contracted. Not only can pattern distortion caused by this method be avoided, but also the occurrence of ink unevenness that occurs between the center and edge of the screen printing plate described above can also be avoided.

For this reason, when used in flexure printing as shown in Figures 5, 6, and 7, it is possible to print with extremely high resolution, and when forming IC circuits etc. by printing, the function is greatly improved. can demonstrate.

Furthermore, unlike conventional screen printing plates, the mesh does not expand or contract during printing, so the mesh itself has a long lifespan and is economical.

In particular, in the present invention, since a synthetic resin film can be used as the surface constituting the printing plate, ink permeable holes of a desired shape can be formed more easily than in a metal plate, and the cost is lower.

As described above, the present invention has an epoch-making significance in the field of screen printing, and the value of the invention is extremely great.

[Brief explanation of drawings]

Figure 1: Schematic diagram of a conventional screen printing mesh Figure 2: Schematic diagram showing the mechanism of conventional screen printing Figure 3 Cross-sectional diagram showing the operating state of conventional screen printing Figure 4 - In conventional screen printing Cross-sectional views showing the state in which the squeegee is not pressing the mesh Figures 5, 6, and 7; Cross-sectional views showing the principle of improved screen printing Figure 8; , a plan view showing that a mesh is required to support the plate portion when the plate is surrounded by ink permeation holes. 1
)) Figure 9(c): Schematic diagram of the non-woven mesh, not showing the state in which the intersecting areas of the lines constituting the woven fabric mesh have been plated or electrowarmed. Cylinder 10 (a
), Figure 10 (Figure bj, sketch showing an embodiment with and without a support at the edge of the printing plate 6 11.12 Supporting both ends of the screen in an improved screen printing machine Holder 2/Squeegee with moving platform
3. Screen printing plate 31. Metal plate part 32
・Mesh 33・Ink permeation hole 4・Fixed frame used in conventional screen printing 41.42・Support 5・Part that grips the fixed frame used in conventional screen printing 6・Print substrate 7・Support Table 8・Screen printing machine table 9・Ink 2-2 -To-One procedure Shinyu Usansho September 10, 1990 1, thing/! Display of t 1990 Patent Application No. 36396 2
, Title of the invention Flexure printing plate 3, Relationship to the case of the person making the amendment Patent applicant address (residence) 301 Heim Sakuradai, 3-47-6 Sakuradai, Nerima-ku, Tokyo Name: Masanao Ozeki 4; Agent 〒], ], 0 Address (residence) No. 1402, 4-8 Yushima, Bunkyo-ku, Tokyo 8゜ (1) Details of drawing amendments Figure 9 will be amended as shown in the attached sheet.

Claims (3)

[Claims] (1) A mesh that is difficult to deform in the plane direction and is flexible against weaving and bending in the normal direction, and a synthetic resin that has ink permeation holes in a desired pattern shape and can be woven and bent freely. A printing plate for flexure printing by not using a fixed frame surrounding the four circumferences of the bonded plate film and mesh. (2) A plated mesh is used in which metal wires are woven as a mesh that is difficult to deform in the plane direction, and the nodal parts where the metal wires of the woven mesh intersect are joined by plating. Flexure printing plate described in range (1) (3) Claims characterized in that a non-woven metal mesh is used as the mesh that is difficult to deform in the plane direction (
Flexure printing plate (4) according to claim (1), characterized in that a plated mesh in which the surface of a plastic mesh is plated with metal is used as the mesh that is difficult to deform in the surface direction. printing plate